after market pipe...bottom-line

[Jim Douglas]

Yesterday the wife's BMW started kicking and rocking after starting up, we had been driving it on and off all day, shi$ another trip to the BMW dealer! Called AAA for the tow and the driver convinced both wife and me that there was 'condesation' in the gas tank and we need to get some of the 'HEET' stuff to clean it up, he had said that numerous calls recently in TX , very rainy last few days, followed by heat, would cause the issue, well it didn't fix it at all. I had never heard of this issue except in winter, real cold with the condensation freezing? Opinions? Thaks!

[Chris Norloff]

It's possible to get water in the gas any time of year, though water-in-the-tank freezing in the winter is more common. I would think with all the ethanol in today's gasoline that there'd never be any water left (that's all the HEET stuff is, alcohol either in methanol or ethanol form). Chris -----Original Message----- From: DSN_KLR650@yahoogroups.com [mailto:DSN_KLR650@yahoogroups.com] On Behalf Of Jim Douglas Sent: Wednesday, August 20, 2008 8:05 AM To: DSN _KLR650 Subject: [DSN_KLR650] NON KLR-Car Yesterday the wife's BMW started kicking and rocking after starting up, we had been driving it on and off all day, shi$ another trip to the BMW dealer! Called AAA for the tow and the driver convinced both wife and me that there was 'condesation' in the gas tank and we need to get some of the 'HEET' stuff to clean it up, he had said that numerous calls recently in TX , very rainy last few days, followed by heat, would cause the issue, well it didn't fix it at all. I had never heard of this issue except in winter, real cold with the condensation freezing? Opinions? Thaks!

[dooden]

Not able to say if it is or not, but can say my preferred additive for moisture in fuel is "NOX ICE" (used to be in a black bottle) HEET maybe if nothing else is available. Seen NOX ICE at Carquest, Advance Auto Parts and guessing most Napa dealers carry it. Dooden A15 Green Ape --- In DSN_KLR650@yahoogroups.com, Jim Douglas wrote:

> > Yesterday the wife's BMW started kicking and rocking after starting

up,

> we had been driving > it on and off all day, shi$ another trip to the BMW dealer! Called

AAA

> for the tow and the > driver convinced both wife and me that there was 'condesation' in

the

> gas tank and we need > to get some of the 'HEET' stuff to clean it up, he had said that > numerous calls recently in TX > , very rainy last few days, followed by heat, would cause the

issue,

> well it didn't fix it at all. > I had never heard of this issue except in winter, real cold with

the

> condensation freezing? > > Opinions? > > Thaks! >

[boulder_adv_rider]

Every after-market pipe suggests (if not requires) rejetting to larger jets. Primarily, this is the reason for any performance gain: more fuel (maybe 1 to 4 hp?). But we're talking mpg/efficiency here vs. power gain as the reason/catalyst for changing the exhaust. If you want raw power gain, well then, I strongly suggest NO2--a nitrous oxide system. Increasing the jet sizes adds more fuel and perhaps power...NOT efficiency. Furthermore, I suspect with a new throaty sound and "feeling" of more power (think crotch rocket), it's likely the rider will apply more often more throttle than is necessary. As you're about to learn (or re-acquaint yourself with), the faster you go on the highway (adding notable increase in wind resistance) the WORSE your fuel economy becomes. The power required to overcome aerodynamic drag is given by: P(d) = F(d) * v = 1/2 pv^3AC(d) The power needed to push an object through a fluid increases as the cube of the velocity. A car cruising on a highway at 50 mph (80 km/h) may require only 10 horsepower (7.5 kW) to overcome air drag, but that same car at 100 mph (160 km/h) requires 80 hp (60 kW). With a doubling of speed the drag (force) quadruples per the formula. Exerting four times the force over a fixed distance produces four times as much work. At twice the speed the work (resulting in displacement over a fixed distance) is done twice as fast. Since power is the rate of doing work, four times the work done in half the time requires eight times the power. Bottom-line: I would not recommend changing the exhaust for fuel economy. I would recommend changing it if you like: the sound, look and/or weight-savings offered by a particular unit. Power gain is so negligible, it's not worth the $400+ cost, added maintenance, or louder sound in my opinion. Also, you have to consider the life- cycle cost of the replacement exhaust which [with non-mechanical baffles rated USFS-approved] requires periodic maintenance (time + material) repacking the baffles every 1.5k-2k miles.